<!DOCTYPE html>
<html>
<head lang="en">
    <meta charset="UTF-8">
    <title></title>
    <style>
        body{
            /*background-color: red;*/
            padding: 0;
            margin: 0;
        }

        div{
            background-color: red;
            width: 250px;
            height: 140px;
            border: 4px solid blue;
            /*内边距*/
            padding: 100px;
            margin: 30px;
        }

    </style>
</head>
<body>
    <div>12302302</div>
    <div>2322323232</div>
</body>
</html>